# -*- coding: utf-8 -*-
"""
Created on Wed Jun 23 13:53:18 2021

@author: Study
"""
import math

a=input("请输入脚长:")
try:
    n=float(a)
    if n>5:  
        b=math.floor(n)
        if n-b>0.5:   #标准化脚长
            n=b+1
        elif n-b==0:
            n=b
        else:
            n=b+0.5
        print("你所适合的鞋码为："+str(int(n*2-10)))
    else:
        print("Sorry!我找不到适合你的鞋码。")
except ValueError:
    print("温馨提示:你输入的数据有误！")